.\" -*- mode: troff; coding: utf-8 -*-
.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
.ie n \{\
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds C`
.    ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\"
.\" Required to disable full justification in groff 1.23.0.
.if n .ds AD l
.\" ========================================================================
.\"
.IX Title "Appender::RRDs 3"
.TH Appender::RRDs 3 2026-08-14 "perl v5.42.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
Log::Log4perl::Appender::RRDs \- Log to a RRDtool Archive
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 2
\&    use Log::Log4perl qw(get_logger);
\&    use RRDs;
\&    
\&    my $DB = "myrrddb.dat";
\&    
\&    RRDs::create(
\&      $DB, "\-\-step=1",
\&      "DS:myvalue:GAUGE:2:U:U",
\&      "RRA:MAX:0.5:1:120");
\&    
\&    print time(), "\en";
\&    
\&    Log::Log4perl\->init(\eqq{
\&      log4perl.category = INFO, RRDapp
\&      log4perl.appender.RRDapp = Log::Log4perl::Appender::RRDs
\&      log4perl.appender.RRDapp.dbname = $DB
\&      log4perl.appender.RRDapp.layout = Log::Log4perl::Layout::PatternLayout
\&      log4perl.appender.RRDapp.layout.ConversionPattern = N:%m
\&    });
\&    
\&    my $logger = get_logger();
\&    
\&    for(10, 15, 20, 25) {
\&        $logger\->info($_);
\&        sleep 1;
\&    }
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Log::Log4perl::Appender::RRDs\*(C'\fR appenders facilitate writing data
to RRDtool round\-robin archives via Log4perl. For documentation
on RRD and its Perl interface \f(CW\*(C`RRDs\*(C'\fR (which comes with the distribution),
check out <http://rrdtool.org>.
.PP
Messages sent to Log4perl\*(Aqs RRDs appender are expected to be numerical values
(ints or floats), which then are used to run a \f(CW\*(C`rrdtool update\*(C'\fR command
on an existing round\-robin database. The name of this database needs to
be set in the appender\*(Aqs \f(CW\*(C`dbname\*(C'\fR configuration parameter.
.PP
If there\*(Aqs more parameters you wish to pass to the \f(CW\*(C`update\*(C'\fR method,
use the \f(CW\*(C`rrdupd_params\*(C'\fR configuration parameter:
.PP
.Vb 1
\&    log4perl.appender.RRDapp.rrdupd_params = \-\-template=in:out
.Ve
.PP
To read out the round robin database later on, use \f(CW\*(C`rrdtool fetch\*(C'\fR
or \f(CW\*(C`rrdtool graph\*(C'\fR for graphic displays.
.SH LICENSE
.IX Header "LICENSE"
Copyright 2002\-2026 by Mike Schilli <m@perlmeister.com>
and Kevin Goess <cpan@goess.org>.
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.